Pump.



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APPLICATION FILED APR-.15. IQIB.

W. S. HOLDAWAY.

ILEV/,370.

W. S. HOLDAWAY.

PUMP.

Patented Sept. 30, 1919.

2 SHEETS-SHEET 2- @NITE WILLIAM S. HOLDAWAY, OF SALT LAKE CITY, UTAH.

PUMP.

Lainate.

Specification of Letters Patent.

Patenten sept. so, raie.

Application filed April 15, 1918. Serial No. 228,786.

to any desired height, which improvementl is economical in construct-ion, does not require much power to operate, eflicient in qllantity of water deliveredand very dura le.

These objects 1 accomplish with the pump illustrated in the accompanying drawings in which similar letters and numerals of reference indicate like parts throughout'the several figures and as described in the specification forming a part of this application and pointed out in the appended claims.

In the drawings in which I have shown a Asubstantial embodiment of my invention,

Figure 1 is a top plan view of the pump with parts shown in section. Fig. 2 shows the upper portion of the case removed and turned back adjacent. Fig. 3 is a side elevation of the pump. Fig. 4 is a plan view of one of the wall plates. Fig. 5 is a plan view of one of the packing plates. Fig. 6 is a plan view of one of the pressure plates.

My pump is of the screw type in which a pair of screws are employed with intermeshing threads, and arranged within a casing having a suction or inlet chamber at one end and an outlet chamber at the other end andl intermediate chambers between them. The said screws are on parallel horizontal shafts and one has right turned threads and the other left, with the perimeter of one screw bearing against the shaft of the other screw.

The present invention consists of providing screws of `greater length than usual and having plurality of chambers, one for intake and one for discharge and one or more intermediate chambers toprevent leakage around the convolutions and to prevent a passing of the fluid from the outlet chamber to the inlet chamber.'

The casing consists of a bottom portion A. and the top or upper portion B, each of which has two screw channels C therein, within which the screws a and b, one right flanges thereon.

and the other left hand thread, are operated. Sald caslngs are bolted together through An end casing D is provided on the inlet end in which is mounted f the ordinary packing 14 between the plates 12 and 13. Roller bearings 3 are mounted within a casing at the inlet end which act as bearings for one end of the screw shafts 1 and 2. On the said shaft 1 is keyed the driving pulley E and a gear wheel F, which meshes with the -gear wheel G that is secured on the end of said shaft 2. Cn the opposite end of said casing is secured the head casing J, and in which is mounted the roller bearings 4, 0n which is supported the other ends of said shafts 1 and 2. The interior of said casings A. and B when thus bolted together hasthe appearance of two intersecting cylinders with the screws so positioned therein as to leave an inlet chamber K at one end and an outlet chamber L at the other end. rThe suction pipe enters the said inlet chamber K at the side through an opening 5 and the outlet pipe N enters the outlet chamber L on the upper side through an opening 6. By-pass conduits 21 and 23 are provided in the top of said casing B and clean-out valves 7 are provided in the bottom of said casing A through which any sand, grit or other debris may be removed.

Adjacent each set of roller bearings 1 provide a plate 13 against which is provided suitable packing 14 and between said packing a water chamber adjacent a plate 12 is secured. Said plates are secured by the bolts which secure the heads D and J to the casings A and B. To prevent endwise movement of said shafts 1 and 2 collars 15 are secured on said shafts which bear against said plates 12. Shoulders 1.6 are cut on said shafts 1 and 2 which bear against the ends of the roller bearings at the inlet end of the pump to prevent endwise thrust of said shafts. A stuffing boX 17 is provided on the said shaft 1 to prevent leakage at the only point Where the partsof my pump eX- tend without the casing. r1`he interior of said screw channels C is divided by two transversely secured pressure plates 20 and 22, which are alike, and each consists of a sheet of metal shaped to conform with the interior y inders and the threads of one section of each screw intermesh with the threads of the'coacting section -of the other screw, thus forming a plurality of constantly advancing fluid chambers between the convolutiofns of each screw and its shaft, by which when the screws are operated a given quantity of fluid is advanced from the inlet chamber K through one set of coacting screws to the in* termediate chamber d, and from one side of said chamber d around the pressure plate 20 through one of said by-pass conduits 21 to the other side of said intermediate chamber d and then through the next set of coacting screw sections to the other intermediate chamber c, and around the pressure plate 22 therein through the by-pass conduit ,23 tothe other side of Said intermediate chamber c, and then through the next set of coacting screw sections to the outlet chamber L and out through the outlet pipe N to any desired height.

The ob'ect of the intermediate chambers D and C with their respective pressure plates and by-passconduits is to provide increased pressure step by step on the water carried through the pump and to utilize the centrifugal force on the water, in each set of coacting screws to conduct said water around the pressure plates and finally out through the outlet pipe N,

Having thus described my invention and shown novel coacting twin screws of more than the usual force whereby I utilize a combined screw pressure and centrifugal How-to pump water, and with all of the parts in an inclosed case with only one stuiling box and that at the inlet end, Ivdesire to secureby Letters Patent and claimzf l. In a pum the combination of a separable casing; a caring casing detachably secured on each end of said separable casing; roller bearings carried in said last mentioned casing; parallel shafts mountedl in said bearings; intermeshing screws on said shafts spaced from the ends of said first mentioned casing, and with portions of the blades of said screws cut away to form chambers between the e-nd screws and said casing and between said' screws; intermeshing gears secured on said shafts operable in one of the said bearing casings; ingress and egress openings in said end chambers; pressure plates transversely secured in said separable casing to divide the interior into intermediate chambers; b-y-pass conduits to pass fluid around said plates; with bearing collars and plates in said bearing casings t0 prevent send thrust of said shafts.-

2. In a pump comprising a separable casing; pressure plates transversely secured therein to divide said casing into chambers; intermeshing screws operable in each of said chambers; `fby-pass conduits to pass fluid around said pressure plates; and meansv to revolve said screws to move fluid from one of said chambers to another.

In testimony whereof I have afixed my signature.

WILLIAM S. HOLDAWAY. 

